{"title":"使用 SNICS 离子源和加速器质谱仪测量宇宙成因 10Be 时阴极材料对 BeO 电流的影响","authors":"Atsunori Nakamura , Takeyasu Yamagata , Hiroyuki Matsuzaki","doi":"10.1016/j.nimb.2024.165562","DOIUrl":null,"url":null,"abstract":"<div><div>The precision of <sup>10</sup>Be measurements by accelerator mass spectrometry (AMS) relies on the intensity of BeO<sup>-</sup> currents from Cs-sputtered samples. We conducted an experiment to determine the effect of cathode materials on BeO<sup>-</sup> currents for AMS measurements. The peak currents of stainless-steel cathodes were slightly higher than those of Cu cathodes, indicating the benefits of using the former for measuring low-level samples. However, this slight difference may be counteracted by longer measurement times. The difference in the BeO<sup>-</sup> currents is attributed to competitive ionization between BeO and cathode materials. Fe, the primary element in stainless steel, has a significantly lower electron affinity compared to Cu, resulting in reduced electron consumption for BeO ionization. This phenomenon mirrors the effect of metal-matrix selection on BeO<sup>-</sup> current intensity. These results are relevant for optimizing beam currents of other nuclides in AMS measurements and are beneficial for studies conducted using SNICS ion sources.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"558 ","pages":"Article 165562"},"PeriodicalIF":1.4000,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Influence of cathode materials on BeO currents in cosmogenic 10Be measurements using a SNICS ion source and accelerator mass spectrometry\",\"authors\":\"Atsunori Nakamura , Takeyasu Yamagata , Hiroyuki Matsuzaki\",\"doi\":\"10.1016/j.nimb.2024.165562\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>The precision of <sup>10</sup>Be measurements by accelerator mass spectrometry (AMS) relies on the intensity of BeO<sup>-</sup> currents from Cs-sputtered samples. We conducted an experiment to determine the effect of cathode materials on BeO<sup>-</sup> currents for AMS measurements. The peak currents of stainless-steel cathodes were slightly higher than those of Cu cathodes, indicating the benefits of using the former for measuring low-level samples. However, this slight difference may be counteracted by longer measurement times. The difference in the BeO<sup>-</sup> currents is attributed to competitive ionization between BeO and cathode materials. Fe, the primary element in stainless steel, has a significantly lower electron affinity compared to Cu, resulting in reduced electron consumption for BeO ionization. This phenomenon mirrors the effect of metal-matrix selection on BeO<sup>-</sup> current intensity. These results are relevant for optimizing beam currents of other nuclides in AMS measurements and are beneficial for studies conducted using SNICS ion sources.</div></div>\",\"PeriodicalId\":19380,\"journal\":{\"name\":\"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms\",\"volume\":\"558 \",\"pages\":\"Article 165562\"},\"PeriodicalIF\":1.4000,\"publicationDate\":\"2024-11-17\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0168583X2400332X\",\"RegionNum\":3,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"INSTRUMENTS & INSTRUMENTATION\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0168583X2400332X","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"INSTRUMENTS & INSTRUMENTATION","Score":null,"Total":0}
Influence of cathode materials on BeO currents in cosmogenic 10Be measurements using a SNICS ion source and accelerator mass spectrometry
The precision of 10Be measurements by accelerator mass spectrometry (AMS) relies on the intensity of BeO- currents from Cs-sputtered samples. We conducted an experiment to determine the effect of cathode materials on BeO- currents for AMS measurements. The peak currents of stainless-steel cathodes were slightly higher than those of Cu cathodes, indicating the benefits of using the former for measuring low-level samples. However, this slight difference may be counteracted by longer measurement times. The difference in the BeO- currents is attributed to competitive ionization between BeO and cathode materials. Fe, the primary element in stainless steel, has a significantly lower electron affinity compared to Cu, resulting in reduced electron consumption for BeO ionization. This phenomenon mirrors the effect of metal-matrix selection on BeO- current intensity. These results are relevant for optimizing beam currents of other nuclides in AMS measurements and are beneficial for studies conducted using SNICS ion sources.
期刊介绍：
Section B of Nuclear Instruments and Methods in Physics Research covers all aspects of the interaction of energetic beams with atoms, molecules and aggregate forms of matter. This includes ion beam analysis and ion beam modification of materials as well as basic data of importance for these studies. Topics of general interest include: atomic collisions in solids, particle channelling, all aspects of collision cascades, the modification of materials by energetic beams, ion implantation, irradiation - induced changes in materials, the physics and chemistry of beam interactions and the analysis of materials by all forms of energetic radiation. Modification by ion, laser and electron beams for the study of electronic materials, metals, ceramics, insulators, polymers and other important and new materials systems are included. Related studies, such as the application of ion beam analysis to biological, archaeological and geological samples as well as applications to solve problems in planetary science are also welcome. Energetic beams of interest include atomic and molecular ions, neutrons, positrons and muons, plasmas directed at surfaces, electron and photon beams, including laser treated surfaces and studies of solids by photon radiation from rotating anodes, synchrotrons, etc. In addition, the interaction between various forms of radiation and radiation-induced deposition processes are relevant.
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